MAX16821A/MAX16821B/MAX16821C
High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, V
DD
= V
CC
, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LED CURRENT SIGNAL DIFFERENTIAL VOLTAGE AMPLIFIER (DIFF)
Common-Mode Voltage Range V
CMR
DIFF
0 1.0 V
DIFF Output Voltage V
CM
V
SENSE+
= V
SENSE-
= 0V 0.6 V
MAX16821A -3.7 +3.7
Input Offset Voltage V
OS
DIFF
MAX16821B/MAX16821C -1.5 +1.5
mV
MAX16821A 0.992 1 1.008
MAX16821B 5.85 6 6.1Amplifier Voltage Gain A
V(DIFF)
MAX16821C 18.5 20 21.5
V/V
MAX16821A, C
DIFF
= 20pF 1.7 MHz
MAX16821B, C
DIFF
= 20pF 16003dB Bandwidth f
3dB
MAX16821C, C
DIFF
= 20pF 550
kHz
MAX16821A 50 100
MAX16821B 30 60
SENSE+ to SENSE- Input
Resistance
R
VS
MAX16821C 10 20
kΩ
OUTV AMPLIFIER
Gain-Bandwidth Product V
OUTV
= 2V 4 MHz
3dB Bandwidth V
OUTV
= 2V 1 MHz
Output Sink Current 30 µA
Output Source Current 80 µA
Maximum Load Capacitance 50 pF
OUTV to (CSP - CSN) Transfer
Function
4mV ≤ C
SP
- C
SN
≤ 32mV 132.5 135 137.7 V/V
Input Offset Voltage 1mV
VOLTAGE-ERROR AMPLIFIER (EAOUT)
Open-Loop Gain A
VOLEA
70 dB
Unity-Gain Bandwidth f
GBW
3 MHz
EAN Input Bias Current I
B(EA)
V
EAN
= 2V -0.2 +0.03 +0.2 µA
Error Amplifier Output Clamping
Voltage
V
CLAMP
EA
With respect to V
CM
905 930 940 mV
INPUTS (MODE AND OVI)
MODE Input-Voltage High 2V
MODE Input-Voltage Low 0.8 V
MODE Pulldown Current 456µA
OVI Trip Threshold OVP
TH
1.244 1.276 1.308 V
OVI Hysteresis OVI
HYS
200 mV
OVI Input Bias Current I
OVI
V
OVI
= 1V 0.2 µA
